# -*- coding: utf-8 -*-
# author yzs
# date 2018-12-08
#
# Description
# Your task is to calculate the sum of some integers.
# Input
# Input contains an integer N in the first line, and then N lines follow. Each line starts with a integer M, and then M integers follow in the same line.
# Output
# For each group of input integers you should output their sum in one line, and with one line of output for each line in input.
# Sample Input 1 
# 2
# 4 1 2 3 4
# 5 1 2 3 4 5
# Sample Output 1
# 10
# 15

while True:
    data = list(map(int, input().strip().split()))
    n, array = data[0], data[1:]
    if n == 0:
        break
    sum = 0
    for i in range(n):
        sum += array[i]
    print(sum)